JP2003017285A - Ignition device of discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ignition device of a discharge lamp that lights stably a plurality of types of discharge lamps having different characteristics. SOLUTION: The lighting device comprises a power supply section A, a socket section 20, a detection switch 21 that switches on/off according to the shape of the base 1 of the discharge lamps Lp that is different according to the characteristics of the discharge lamps Lp when a discharge lamp Lp is installed on the socket section 20, a discriminating section 11 that discriminates the type of discharge lamps Lp that have each different characteristics according to switching on/off of the detection switch 21, and the control section 10 controls the boosting circuit DD and the inverter circuit INV so that a rated power may be supplied to the discharge lamp Lp according to the distinguished result of the distinguishing section 11. Thereby, the device can ignite stably plural types of discharge lamps Lp having different characteristics without changing the construction of the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device.

[0002]

2. Description of the Related Art Conventionally, for example, as shown in FIG.
There is provided a vehicle-mounted discharge lamp lighting device for lighting a discharge lamp Lp used for a vehicle headlamp, fog lamp, or the like.

The discharge lamp lighting device described above includes a booster circuit DD for boosting the power supply voltage of the DC power source E, an inverter circuit INV for converting the output from the booster circuit DD into an AC voltage, and a high-voltage pulse to start the discharge lamp Lp. Igniter circuit I
A power supply unit A that includes a control unit 10 that controls the GN, the booster circuit DD, the inverter circuit INV, and the igniter circuit IGN, and that supplies power to the discharge lamp Lp, and the discharge lamp Lp.
Is detachably attached, and the discharge lamp Lp is connected to the power supply unit A.
And a socket portion 20 electrically connected to.

Such a discharge lamp lighting device is a discharge lamp Lp.
When lit, the booster circuit DD boosts the power supply voltage of the DC power supply E to a no-load secondary voltage of about 300 to 400 [V], and the no-load secondary voltage is supplied to the inverter circuit INV.
And applied to the discharge lamp Lp via the igniter circuit IGN. Then, a high-voltage pulse of about 20 [kV] is applied to the discharge lamp Lp by the igniter circuit IGN to cause the discharge lamp Lp to break over, thereby starting the lighting of the discharge lamp Lp.

By the way, a plurality of types of halogen lamps having different characteristics such as rated power have been used for headlights and fog lamps of vehicles, and they can be easily replaced with different types of halogen lamps. It was possible to change the light output of the headlights and fog lights.

[0006]

However, in recent years, switching from halogen lamps to HID lamps, which are discharge lamps, has been actively carried out, and, like halogen lamps, characteristics such as rated power differ depending on the purpose of use. Although a plurality of types of HID lamps are commercially available, the above-mentioned conventional discharge lamp lighting device may not be able to light the HID lamps when different types of HID lamps are connected. There was a problem that only the lamp could be turned on.

For example, in the above-mentioned conventional discharge lamp lighting device configured to stably light an HID lamp having a rated power of 35 [W], the rated power is 35 [W] and 50 [W].
When the HID lamps of No. 1 are replaced and connected, the HID lamp of 35 [W] can be turned on with a constant light output, but the HID lamp of 50 [W] may be extinguished due to insufficient current.

The present invention is intended to solve the above problems, and provides a discharge lamp lighting device for stably lighting a plurality of types of discharge lamps having different characteristics.

[0009]

In order to achieve the above object, the invention of claim 1 is a booster circuit for boosting a power supply voltage of a DC power supply, an inverter circuit for converting an output from the booster circuit into an AC voltage, and a booster circuit. A power supply unit that includes a control unit that controls the circuit and the inverter circuit, and that supplies power to the discharge lamp;
A plurality of types of discharge lamps having different characteristics from each other are detachably attached, and a socket section electrically connecting the discharge lamp to the power supply section, and a discriminating means for discriminating the type of the discharge lamp attached to the socket section are provided. The control unit controls the booster circuit and the inverter circuit so that the rated power is supplied to the discharge lamp according to the determination result of the determination unit, and the determination unit determines the type of the discharge lamp having different characteristics. By making the control unit control the booster circuit and the inverter circuit so that the rated power is supplied to the determined type of discharge lamp, a plurality of types of discharge having different characteristics can be obtained without changing the configuration of the device itself. The electric light can be turned on stably.

According to the invention of claim 2, in the invention of claim 1, when the discharge lamp is attached to the socket portion, the discrimination means is turned on / off according to the shape of the base portion of the discharge lamp which differs depending on the type of the discharge lamp. One or a plurality of switch means for turning off is provided, and the type of the discharge lamp is discriminated according to the on / off state of the switch means. When the discharge lamp is attached to the socket part, the type of the discharge lamp is determined. By turning the switch means on or off, the discriminating means can easily discriminate the type of the discharge lamp only by attaching the discharge lamp to the socket portion.

According to a third aspect of the present invention, in the first aspect of the present invention, the determining means discharges the current and voltage from the lamp voltage and the lamp current detected by the current and voltage detecting section for detecting the lamp voltage and the lamp current. The type of discharge lamp is provided by including a calculation unit that calculates the impedance of the electric lamp and a storage unit that stores the reference value of the impedance, and compare the impedance calculated by the calculation unit with the reference value stored in the storage unit. The number of types of discharge lamps that can be easily determined can be increased by simply storing a plurality of reference values in the storage unit.

According to a fourth aspect of the present invention, there is provided a booster circuit for boosting a power supply voltage of a DC power supply, an inverter circuit for converting an output from the booster circuit into an AC voltage, a booster circuit, and a controller for controlling the inverter circuit. An electric power supply unit for supplying electric power to the electric lamp, a plurality of types of discharge lamps having different characteristics from each other are detachably attached, a socket unit for electrically connecting the electric discharge lamp to the electric power supply unit, and a discharge unit attached to the socket unit. Instructing means for instructing the control section as to the type of electric lamp, and the control section controls the booster circuit and the inverter circuit so that the rated power is supplied to the discharge lamp in accordance with the instruction from the instructing means. And, by instructing the type of discharge lamp to the control unit by the instruction means, by causing the control unit to control the booster circuit and the inverter circuit so that the rated power is supplied to the instructed type of discharge lamp, A plurality of types of discharge lamps whose characteristics differ without changing the structure of the 置自 body can be stably lighted.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, a direct-current power source instructing means for instructing a type of direct-current power source having a different power source voltage value, and an instruction from the direct-current power source instructing means According to the above, a switching means for switching the internal state of the booster circuit so that the output voltage of the booster circuit becomes a substantially constant value regardless of the type of the DC power supply, The type of
In response to the instruction, the switching means switches the internal state of the booster circuit to set the output voltage of the booster circuit to a substantially constant value regardless of the type of the DC power source. The discharge lamp can be turned on by using any of the power sources, and the usability can be improved.

According to a sixth aspect of the present invention, in the discharge lamp lighting device according to the third aspect, the power supply voltage detecting means for detecting the power supply voltage of the DC power supply and the timing for comparing the impedance calculated by the calculation unit with a reference value, or Comprising a correction unit for correcting the reference value of the storage unit, the control unit determines from the detection result of the power supply voltage detection unit that the power supply voltage value is smaller than a predetermined value, the power supplied to the discharge lamp is While controlling the booster circuit and the inverter circuit so that they can be suppressed,
The correction unit corrects the timing or the reference value, and when the power supply voltage of the DC power supply drops, the control unit boosts the power supplied to the discharge lamp from the detection result of the power supply voltage detection unit. By controlling the circuit and the inverter circuit, the decrease of the power supply voltage can be suppressed within a predetermined range, and even if the impedance changes due to the decrease of the power supply voltage of the DC power supply, the timing or the reference is corrected by the correction means. By correcting the value, the discriminating unit can properly discriminate the type of the discharge lamp.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) Since the basic structure of this embodiment is common to that of the conventional example, the same parts are designated by the same reference numerals, and the description thereof will be omitted. Only the part will be described in detail.

In this embodiment, as shown in FIG. 1, when the discharge lamp Lp is attached to the socket portion 20, it is turned on / off according to the shape of the base portion 1 of the discharge lamp Lp which differs depending on the type of the discharge lamp Lp. The detection switch 21 is provided in the socket unit 20, and the control unit 10 of the power supply unit A is provided with a determination unit 11 that determines the type of the discharge lamp Lp according to ON / OFF of the detection switch 21. Here, in the present embodiment, the detection switch 21 and the determination unit 11 constitute a determination unit.

The base portion 1 of the discharge lamp Lp is attached to the socket portion 20 of the discharge lamp Lp (in the direction of the arrow shown in FIG. 1).
A flange portion 2 is formed so as to protrude in a direction substantially perpendicular to the recess portion 3 and the periphery of the flange portion 2 is provided with a recess 3 as shown in FIG.
Is provided. Further, the position of the concave portion 3 on the periphery of the flange portion 2 is different for each type classified due to the difference in characteristics of the discharge lamp Lp.

On the other hand, as shown in FIG. 3, the detection switch 21 provided in the socket 20 has a contact opening / closing mechanism (not shown) for opening / closing the contact, a case 21a for housing the contact opening / closing mechanism, and a case. A pin 21b is attached to the case 21a so as to protrude substantially vertically from the surface of the contact 21a, and slides in the substantially vertical direction to open and close the contacts in the contact opening / closing mechanism. In the detection switch 21, the contact is normally closed and turned off, and the pin 21b is pushed into the case 21a.
The contact closes and turns on.

As shown in FIG. 4, such a detection switch 21 is located around the portion of the socket 20 where the discharge lamp Lp is attached, and the pin 21b faces outward along the attachment direction of the discharge lamp Lp. In addition, when a specific type of discharge lamp Lp is attached to the socket portion 20, the pin 21b is disposed in the recess 3 provided in the discharge lamp Lp.

Therefore, when the specific type of discharge lamp Lp is attached to the socket portion 20, as shown in FIG. 3, the pin 21b of the detection switch 21 is inserted into the recess 3 of the discharge lamp Lp and placed in the case 21a. The detection switch 21 is off because it is kept in a non-pushed state.
However, when replaced with another type of discharge lamp Lp,
Since the position of the concave portion 3 in the flange portion 2 of the discharge lamp Lp is different from the position in the specific type of discharge lamp Lp,
The pin 21a of the detection switch 21 comes into contact with the collar portion 2 of the discharge lamp Lp and is pushed into the case 21a. This allows
The detection switch 21 is turned on and outputs a type detection signal to the determination unit 11.

As a result, the discriminating section 11 determines that the discharge lamp Lp attached to the socket section 20 is in accordance with the type detection signal.
It discriminates the type and outputs a discrimination signal.

Further, the control unit 10 of this embodiment includes the above-mentioned discrimination unit 11, the booster circuit DD and the inverter circuit INV.
Power control unit 12 for outputting a control signal to each of them to vary the power supplied to the discharge lamp Lp, and to the power control unit 12 for varying the power according to the determination signal of the determination unit 11. A switching instruction unit 13 for instructing switching is provided. Here, the switching instruction unit 13 is the power control unit 12
When instructing to switch the control signal, it is instructed to supply the rated power suitable for the type of the discharge lamp Lp connected to the socket 20 to the discharge lamp Lp based on the determination signal.

That is, in this embodiment, when any one of the two types of discharge lamps Lp having different rated powers is attached to the socket portion 20, the determination portion 11 determines the type of the discharge lamp Lp and the control portion 10 determines. Since the booster circuit DD and the inverter circuit INV are controlled according to the determination result of the section 11, the discharge lamp Lp attached to the socket section 20 is supplied with rated power without changing the configuration of the device itself.
It is possible to stably turn on p at the rated light output. Further, when the discharge lamp Lp is attached to the socket portion 20, the detection switch 21 is turned on or off according to the type of the discharge lamp Lp. Therefore, only by attaching the discharge lamp Lp to the socket portion 20, the detection lamp 21 is easily released to the determination portion 11. The type of the electric lamp Lp can be discriminated.

For example, even if the HID lamp having a rated power of 35 [W] is replaced with an HID lamp having a rated power of 50 [W], the HID lamp is not extinguished due to insufficient current as in the conventional example. It can be turned on.

By the way, in the present embodiment, the detection switch 2
1 is provided in the socket portion 20, but a plurality of detection switches 21 are provided, and the concave portion 3 in the flange portion 2 of the discharge lamp Lp is provided.
Of the three or more types of discharge lamps Lp depending on the position of
Alternatively, the control unit 10 may control the booster circuit DD and the inverter circuit INV so that the rated power is supplied to each type of discharge lamp Lp. (Embodiment 2) Since the basic configuration of this embodiment is the same as that of the conventional example, common portions are denoted by the same reference numerals and description thereof is omitted, and only the characteristic portion of this embodiment will be described in detail. .

As shown in FIG. 5, the power supply unit A of this embodiment includes a current / voltage detection unit 30 for detecting a lamp voltage and a lamp current based on a signal from the booster circuit DD, and a current / voltage detection unit 30. A calculator 31 for calculating the impedance of the discharge lamp Lp from the detected lamp voltage and lamp current.
And a storage unit 32 that stores a reference value of impedance,
And a determination unit 33 that determines the type of the discharge lamp Lp having different characteristics by comparing the impedance calculated by the calculation unit 31 with the reference value stored in the storage unit 32 when the discharge lamp Lp is started. There is. Then, the control unit 10 of the present embodiment controls the booster circuit DD and the inverter circuit INV so that the rated power is supplied to the discharge lamp Lp according to the determination result of the determination unit 33. Here, in the present embodiment, the current / voltage detection unit 30, the calculation unit 31, the storage unit 32, and the determination unit 33 constitute a determination unit.

As a result, in this embodiment, the discriminating unit 33 discriminates the type of the discharge lamp Lp from the impedance of the discharge lamp Lp, and the control unit 10 is controlled so that the rated electric power is supplied to the discriminating discharge lamp Lp. By performing the control, it is possible to stably turn on, for example, a plurality of types of discharge lamps Lp having different rated powers with the rated light output without changing the configuration of the device itself. Further, even if the impedances of the discharge lamps Lp of the same type have variations, the determination unit 33 cannot determine the type of the discharge lamps Lp due to the variation of the discharge lamps Lp by providing the reference value to be compared with a range. This can be prevented, and the determination unit 33 can appropriately determine the type of the discharge lamp Lp.

Further, by simply storing a plurality of reference values in the storage unit 32, the discharge lamp Lp which can be easily discriminated without disposing a plurality of detection switches 21 in the socket unit 20 as in the first embodiment. You can increase the number of types.

In this embodiment, the current / voltage detector 30 is used.
Although the lamp voltage and the lamp current are detected based on the signal from the booster circuit DD, they may be detected based on the signal from the inverter circuit INV. (Embodiment 3) Since the basic configuration of this embodiment is the same as that of the conventional example, common portions are denoted by the same reference numerals and description thereof is omitted, and only the characteristic portion of this embodiment will be described in detail. .

As shown in FIG. 6, the control section 10 of the present embodiment detects the lamp voltage based on the signal from the booster circuit DD and the voltage detection section 14 according to the detection result of the voltage detection section 14. Electric power for outputting a control signal to each of the discriminating unit 11a that discriminates the type of the discharge lamp Lp having different characteristics and outputs a discrimination signal, and the booster circuit DD and the inverter circuit INV to vary the electric power supplied to the discharge lamp Lp. The control unit 12 and the switching instruction unit 13 that instructs the power control unit 12 to switch the control signal so that the rated power is supplied to the discharge lamp Lp according to the determination signal of the determination unit 11a.

Here, for example, as shown in FIG. 7, in three commercially available discharge lamps LpA, LpB, and LpC having different characteristics used for car headlamps and fog lamps, the rise time until the lamp voltage VLA stabilizes, respectively. Are different. Discharge lamp Lp with both rated power of 35 [W]
For A and LpB, the rise time of the discharge lamp LpA is
The rated power is 5 faster than the rise time of the discharge lamp LpB.
The rising time of the discharge lamp LpC of 0 [W] is equal to that of the discharge lamp LpC.
Slower than B. The discharge lamp LpA is a so-called D2S type or D2R type discharge lamp, and the discharge lamps LpB and LpC are so-called DLL type discharge lamps.

Therefore, in the present embodiment, the discriminating means is composed of the voltage detecting section 14 and the discriminating section 11a.
1a is a discharge lamp Lp based on the detection result of the voltage detection unit 14.
Of the discharge lamp Lp is determined from the measured rising time. Thereby, the power control unit 12 of the control unit 10 responds to the instruction from the switching instruction unit 13 based on the determination signal of the determination unit 11a, as in the first embodiment.
A control signal is output to the booster circuit DD and the inverter circuit INV to switch the power supplied to the discharge lamp Lp to the rated power suitable for the type of the discharge lamp Lp.

Further, in the present embodiment, when the gas enclosed in the arc tube of the discharge lamp Lp gradually escapes (slow leak), the overcurrent is generated when the discharge lamp Lp is abnormal such that the lamp voltage VLA becomes extremely small. Is provided with a slow leak protection function of stopping or suppressing the power supply to the discharge lamp Lp so that the current does not flow.

That is, as shown in FIG. 6, the control unit 10 of the present embodiment stores the value when the predetermined time T1 has elapsed since the application of the lamp voltage VLA detected by the voltage detection unit 14 and the lamp voltage. When the stored value of VLA is compared with the threshold value Vth and it is determined that the value of the lamp voltage VLA is smaller than the threshold value Vth, the power control unit 12
Slow leak protection circuit 1 that outputs a slow leak signal to
5b and a threshold value switching circuit 15a for switching the threshold value Vth to another value according to the determination signal of the determination unit 11a, and the power control unit 12 receives the control signal according to the instruction from the switching instruction unit 13 based on the determination signal. Is output to switch the power supplied to the discharge lamp Lp to a rated power suitable for the type of the discharge lamp Lp, if a slow leak signal is output from the slow leak protection circuit 15b, the switching control is performed. The booster circuit DD and the inverter circuit INV so that the power supply to the discharge lamp Lp is stopped or suppressed without outputting a signal.
To control.

Here, when the switching instructing section 13 instructs the power control section 12a based on the discrimination signal, the threshold switching circuit 1
5a switches the threshold value Vth to a value suitable for the type of the discharge lamp Lp based on the determination signal from the determination unit 11a. For example, as shown in FIG. 7, the threshold value is Vth when the discharge lamp LpA is turned on, and the threshold value Vth is switched to Vth ′ when the discharge lamp LpB is replaced. As a result, in the present embodiment, when the lamp voltage VLA rises and the discharge lamp LpB tries to light normally, the threshold value Vth does not match the discharge lamp LpB, and T1 time has elapsed from the start of the rise of the lamp voltage VLA. Since the lamp voltage VLA is equal to or lower than the threshold value Vth when it is determined that the discharge lamp LpB is erroneously determined to be abnormal, the discharge lamp LpB is determined.
It is possible to prevent the power supply to the power supply from being stopped.

As described above, in the present embodiment, it is possible to stably light a plurality of types of discharge lamps Lp having different characteristics, and to properly judge the abnormality of the discharge lamp Lp to detect the abnormality in the discharge lamp Lp. The power supply can be reduced to improve safety. (Embodiment 4) Since the basic configuration of the present embodiment is the same as that of the third embodiment, common portions are denoted by the same reference numerals and description thereof is omitted, and only the characteristic portion of the present embodiment will be described in detail. To do.

In the third embodiment, the discriminating unit 11a discriminates the type of the discharge lamp Lp having different characteristics such as rated power from each other according to the lamp voltage detected by the voltage detecting circuit 14, but in the present embodiment, As shown in FIG. 8, the power supply unit A is provided with an instruction unit 34 that outputs an instruction signal for instructing the type of the discharge lamp Lp to the determination unit 11a, and the determination unit 11a determines the discharge lamp Lp according to the instruction signal. Determine the type.

The instruction means 34 is, for example, a mechanical changeover switch, and when this changeover switch is operated, it outputs an instruction signal to the determination section 11a to determine the type of the discharge lamp Lp connected to this embodiment. Instruct the section 11a. Further, when the control unit 10 is composed of a microcomputer having a rewritable ROM, the instruction means 34 may be composed of the ROM and the microcomputer. In this case, the contents of the ROM are rewritten so that the microcomputer has the contents of the ROM. Is read out, and an instruction signal according to the type of the discharge lamp Lp written in the ROM is output to the determination unit 11a.

As a result, similarly to the first to third embodiments, in this embodiment, for example, a plurality of types of discharge lamps Lp having different rated powers can be stably lit with the rated light output without changing the configuration of the device itself. You can do it. (Fifth Embodiment) Since the basic configuration of this embodiment is the same as that of the fourth embodiment, common portions are denoted by the same reference numerals and description thereof will be omitted, and only a characteristic portion of the present embodiment will be described in detail. To do.

The booster circuit DD of this embodiment is, for example, as shown in FIG.
As shown in 0, the primary winding n connected to the DC power source E side
1. Secondary winding n2 connected to the inverter circuit INV side
Composed of a transformer T, a switching element Q1 connected between the primary winding n1 and the DC power source E, and a primary winding n1.
A switching element Q2 connected in parallel to the series circuit of the switching element Q1 and a part of the primary winding n1 is provided by using the intermediate tap t1 provided in the.

As shown in FIG. 9, the control unit 10 of this embodiment is used in accordance with the power supply voltage detection circuit 16 for detecting the power supply voltage of the DC power supply E and the detection result of the power supply voltage detection circuit 16. The switching element is switched to either Q1 or Q2, and the switched switching element Q
1 and Q2 are turned on / off at a substantially constant cycle, and the power control unit 12 turns on the switching elements Q1 and Q2 that are switched by the drive circuit 17 in response to an instruction from the switching instruction unit 13. The cycle of turning on / off and the on-duty are varied to supply the rated power to the discharge lamp Lp.

In this embodiment, the power supply voltage from the power supply voltage detection circuit 16 and the drive circuit 17 is about 12 [V].
And about 24 [V] form a direct current power source instructing means for instructing different types of direct current power source E, and the drive circuit 17 constitutes a switching means.

When the power supply voltage of the DC power supply E is about 12 [V], the power supply voltage detection circuit 16 detects the power supply voltage and the drive circuit 17 turns off the switching element Q1 to periodically switch the switching element Q2. To turn on / off. The power supply voltage of the DC power supply E is about 24 [V].
When the power supply voltage detection circuit 16 detects the power supply voltage, the drive circuit 17 reversely switches the switching element to be used from Q2 to Q1 and switches the switching element Q2 in the off state.
Is turned on / off periodically. As a result, the booster circuit DD
Is about 2 [V] when the power supply voltage of the DC power supply E is about 12 [V].
At the time of 4 [V], the switching element used is Q
By switching to either one of Q1 and Q2, the boost ratio is varied so that the output voltage from the boost circuit DD becomes a substantially constant value.

As described above, in this embodiment, since the drive circuit 17 is caused to switch the internal state of the booster circuit DD according to the type of the DC power source E, the power source voltage is about 12 [V].
The discharge lamp Lp can be turned on by using any of the two types of DC power sources E that are different from each other at about 24 [V], and the usability can be improved.

For example, a plurality of types of DC power supplies having different power supply voltages are loaded in an electric vehicle, and it is not limited to one type of DC power source for lighting the headlights of the electric vehicle using this embodiment. The headlight can be turned on by selecting a DC power source from a plurality of types and operating this embodiment.

In this embodiment, the DC power source instructing means is composed of the power source voltage detecting circuit 16 and the drive circuit 17. However, for example, a DC power source instructing means such as a changeover switch which is operated to instruct the type of the DC power source E. Means may be configured. (Sixth Embodiment) Since the basic configuration of this embodiment is the same as that of the second embodiment, common parts are denoted by the same reference numerals and description thereof is omitted, and only the characteristic part of the present embodiment will be described in detail. To do.

As shown in FIG. 11, the power supply unit A of this embodiment includes a power supply voltage detection circuit 16a for detecting the power supply voltage of the DC power supply E. The determination unit 33 of the present embodiment includes a correction unit that reads and corrects the reference value stored in the storage unit 32, and the control unit 10 determines the power supply voltage value from the detection result of the power supply voltage detection circuit 16a. When it is determined that is smaller than a predetermined value, the booster circuit DD and the inverter circuit I are controlled so that the power supplied to the discharge lamp Lp can be suppressed.
The NV is controlled, and the correction means corrects the reference value.

For example, when the DC power source E deteriorates and its internal impedance increases, or when the discharge lamp Lp is started, the electric power required to light the discharge lamp Lp is supplied to the discharge lamp Lp. The control unit 10 uses the booster circuit DD
By controlling the inverter circuit INV and the inverter circuit INV, the input power input from the DC power supply E is increased as compared with the case other than the above-mentioned time, and thus the input current input from the DC power supply E to the device itself is also increased. As a result, the power supply voltage of the DC power supply E drops.

Therefore, in this embodiment, the power supply voltage detection circuit 16a is provided as described above, and when the power supply voltage value of the DC power supply E is smaller than a predetermined value, the control unit 10 is supplied with power to the discharge lamp Lp. By controlling the booster circuit DD and the inverter circuit INV so as to be suppressed, it is possible to suppress the above-mentioned decrease in the power supply voltage within a predetermined range. Also,
At this time, the temporal change of the impedance of the discharge lamp Lp fluctuates, but the determination unit 33 is provided with a correction unit, and the control unit 10 causes the correction unit to have the reference value of the storage unit 32 according to the detected power supply voltage value. By correcting the
It is possible to accurately determine the type of the discharge lamp Lp.

In the present embodiment, the correcting means corrects the reference value in the storage section 32. However, the timing for comparing the impedance calculated by the calculating section 31 with the reference value may be corrected by the correcting means.

[0051]

The invention of claim 1 comprises a booster circuit for boosting the power supply voltage of the DC power supply, an inverter circuit for converting the output from the booster circuit into an AC voltage, a booster circuit, and a control unit for controlling the inverter circuit. A power supply unit for supplying electric power to the discharge lamp, and a plurality of types of discharge lamps having different characteristics from each other are detachably attached, and a socket unit for electrically connecting the discharge lamp to the power supply unit and a socket unit are attached to the socket unit. The control unit controls the booster circuit and the inverter circuit so that the rated power is supplied to the discharge lamp according to the determination result of the determination unit. The discriminating means discriminates between the different types of discharge lamps, and the control unit controls the booster circuit and the inverter circuit so that the rated electric power is supplied to the discriminated types of discharge lamps. Without changing the structure, there is an effect that a plurality of types of discharge lamps have different characteristics can be stably lighted.

According to a second aspect of the present invention, the discriminating means is one or a plurality of switches which are turned on / off according to the shape of the base portion of the discharge lamp which differs depending on the type of the discharge lamp when the discharge lamp is attached to the socket portion. Since the type of the discharge lamp is determined according to the on / off state of the switch means, the switch means is turned on or off according to the type of the discharge lamp when the discharge lamp is attached to the socket part. There is an effect that the discriminating means can easily discriminate the type of the discharge lamp only by mounting the discharge lamp on the socket portion.

According to a third aspect of the present invention, the discriminating means calculates the impedance of the discharge lamp from the current voltage detecting section for detecting the lamp voltage and the lamp current, and the lamp voltage and the lamp current detected by the current voltage detecting section. Unit, and a storage unit for storing a reference value of impedance, by comparing the impedance calculated by the calculation unit with the reference value stored in the storage unit, to determine the type of discharge lamp,
The number of types of discharge lamps that can be easily identified can be increased by simply storing a plurality of reference values in the storage unit.

The invention of claim 4 is provided with a booster circuit for boosting the power supply voltage of the DC power supply, an inverter circuit for converting the output from the booster circuit into an AC voltage, a booster circuit and a control section for controlling the inverter circuit. An electric power supply unit for supplying electric power to the electric lamp, a plurality of types of discharge lamps having different characteristics from each other are detachably attached, a socket unit for electrically connecting the electric discharge lamp to the electric power supply unit, and a discharge unit attached to the socket unit. The control unit controls the booster circuit and the inverter circuit so that the rated power is supplied to the discharge lamp according to the instruction from the instruction unit. By instructing the type of discharge lamp to the control unit by means and causing the control unit to control the booster circuit and the inverter circuit so that the rated power is supplied to the instructed type discharge lamp, the device itself There is an effect that a plurality of types of discharge lamps whose characteristics differ without changing the formation can be stably lighted.

According to a fifth aspect of the present invention, there is provided a DC power source instructing means for instructing the type of DC power source having different power source voltage values.
According to the instruction from the DC power source instructing means, there is provided a switching means for switching the internal state of the boosting circuit so that the output voltage of the boosting circuit becomes a substantially constant value regardless of the type of the DC power source. By instructing the instructing means to instruct the type of the DC power supply and causing the switching means to switch the internal state of the booster circuit in accordance with the instruction, the output voltage of the booster circuit is set to a substantially constant value regardless of the type of the DC power supply. The discharge lamp can be turned on by using any of a plurality of types of DC power supplies having different power supply voltage values, and the usability can be improved.

According to a sixth aspect of the present invention, in the discharge lamp lighting device according to the third aspect, the power supply voltage detecting means for detecting the power supply voltage of the DC power supply and the timing for comparing the impedance calculated by the calculation unit with the reference value, or Comprising a correction unit for correcting the reference value of the storage unit, the control unit determines from the detection result of the power supply voltage detection unit that the power supply voltage value is smaller than a predetermined value, the power supplied to the discharge lamp is While controlling the booster circuit and the inverter circuit so that they can be suppressed,
Since the correction means corrects the timing or the reference value, when the power supply voltage of the DC power supply drops, the booster circuit and the inverter are provided in the control unit so that the power supplied to the discharge lamp can be suppressed from the detection result of the power supply voltage detection means. By controlling the circuit, the drop of the power supply voltage can be suppressed within a predetermined range, and even if the impedance changes due to the drop of the power supply voltage of the DC power supply, the correction means corrects the timing or the reference value. By doing so, there is an effect that the discriminating unit can properly discriminate the type of the discharge lamp.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment.

FIG. 2 is a top view of a discharge lamp used in the above.

FIG. 3 is a side view showing the above detection switch and a main part of a base portion of a discharge lamp.

FIG. 4 is a side view of the socket and the discharge lamp of the above.

FIG. 5 is a schematic circuit configuration diagram showing a second embodiment.

FIG. 6 is a schematic circuit configuration diagram showing a third embodiment.

FIG. 7 is an explanatory diagram of the above.

FIG. 8 is a schematic circuit configuration diagram showing a fourth embodiment.

FIG. 9 is a schematic circuit configuration diagram showing a fifth embodiment.

FIG. 10 is a schematic circuit diagram showing an example of a booster circuit of the same.

FIG. 11 is a schematic circuit configuration diagram showing a sixth embodiment.

FIG. 12 is a schematic circuit configuration diagram showing a conventional example.

[Explanation of symbols]

1 mouthpiece 10 Control unit 11 Discriminator 20 Socket 21 Detection switch A power supply section DD booster circuit E DC power supply IGN igniter circuit INV inverter circuit Lp discharge lamp

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3K072 AA11 AA13 AB09 BA03 BB01                       CA16 DD06 EA06 EA07 EB02                       EB09 EB10 GB01 GC04

Claims (6)

[Claims] 1. A power supply to a discharge lamp, comprising a booster circuit for boosting a power supply voltage of a DC power supply, an inverter circuit for converting an output from the booster circuit into an AC voltage, a booster circuit and a control unit for controlling the inverter circuit. A power supply unit and a plurality of types of discharge lamps having different characteristics from each other are detachably attached, and a socket unit for electrically connecting the discharge lamp to the power supply unit and a type of the discharge lamp attached to the socket unit are determined. The discharge lamp lighting device is characterized in that the control unit controls the booster circuit and the inverter circuit so that the rated power is supplied to the discharge lamp according to the determination result of the determination means. 2. The discriminating means comprises one or a plurality of switch means for turning on / off according to the shape of the base portion of the discharge lamp which is different depending on the type of the discharge lamp when the discharge lamp is attached to the socket portion, The type of discharge lamp is discriminated according to whether the switch means is turned on or off.
The discharge lamp lighting device described. 3. The determination means includes a current-voltage detector that detects a lamp voltage and a lamp current, a calculator that calculates the impedance of the discharge lamp from the lamp voltage and the lamp current detected by the current-voltage detector, and an impedance detector. The storage unit for storing a reference value is provided, and the type of the discharge lamp is determined by comparing the impedance calculated by the calculation unit with the reference value stored in the storage unit. Discharge lamp lighting device. 4. A booster circuit for boosting the power supply voltage of a DC power supply, an inverter circuit for converting an output from the booster circuit into an AC voltage, a booster circuit, and a control section for controlling the inverter circuit, to supply electric power to a discharge lamp. A power supply unit and a plurality of types of discharge lamps having different characteristics are detachably attached, and the socket unit electrically connecting the discharge lamp to the power supply unit and the type of the discharge lamp attached to the socket unit are controlled. Discharge lamp lighting, characterized in that the control section controls the booster circuit and the inverter circuit so that the rated power is supplied to the discharge lamp in accordance with an instruction from the instruction section. apparatus. 5. A direct-current power source instructing means for instructing a type of direct-current power source having different power-supply voltage values, and an output voltage of the booster circuit irrespective of the type of the direct-current power source according to an instruction from the direct-current power source instructing means The discharge lamp lighting device according to any one of claims 1 to 4, further comprising: a switching unit that switches the internal state of the booster circuit so as to have a substantially constant value. 6. A power supply voltage detecting means for detecting a power supply voltage of a direct current power supply, a timing for comparing the impedance calculated by the calculating portion with a reference value, or a correcting means for correcting the reference value of the storage portion, The control unit, from the detection result of the power supply voltage detection means, when determining that the power supply voltage value is smaller than a predetermined value, while controlling the booster circuit and the inverter circuit so that the power supplied to the discharge lamp is suppressed,
4. The discharge lamp lighting device according to claim 3, wherein the correcting means corrects the timing or the reference value.